I just now read FAA Order 8130.2J chapters 2 and 4 and Appendex D (Table D-1) describing the inspection protocol and what is expected when inspecting an aircraft with an experimental airworthiness certificate. The only implication I found that instruments must be installed in the aircraft is the requirement for various V-speeds be recorded during Phase 1. This implies there will be an airspeed indicator.....of some sort (could be a Hall wind meter for a very slow, light aircraft).
For my education......please point out the section(s) of the Order that require an aircraft with an experimental airworthiness be equipped with instruments (in addition to an implied airspeed indicator) for Day VFR operation when the airworthiness certificate is issued.
Thank you.